| Heathkit Most Accurate Clock (HMAC) Click on photos to see enlargement. |
| Sync-Up History Data for 1991 | ||||
| View 1991 Raw Sync-Up Data | ||||
| 5 MHz Sync-Up History | 10 MHz Sync-Up History | |||
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| 15 MHz Sync-Up History | Composite Sync-Up History | |||
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